Consider the Following: on an Annual Basis,C Exchange from Photosynthesis

question 58

Multiple Choice

Consider the following: on an annual basis,C exchange from photosynthesis is 120 Gt,decomposition is 60 Gt,respiration is 60 Gt,ocean uptake of CO2 is 92 Gt of C,ocean release is 91 Gt C,release of C to the atmosphere from anthropogenic sources (fossil fuel use and land use change) is 6 Gt,and the atmosphere is increasing by 3.2 Gt of C.If terrestrial processes are responsible for the remaining C for net balance of the C cycle,then which of the following is likely?

• A)The terrestrial surface is a net sink of 1.8 Gt of C.
• B)The terrestrial surface is a net source of 1.8 Gt of C.
• C)The terrestrial surface is a net sink of 2.8 Gt of C.
• D)The terrestrial surface is a net source of 2.8 Gt of C.

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